Abstract
In polycristalline ceramics, the R-Curve effect plays a significant role on the crack propagation. For macrocracks, a decrease of velocity is observed as a function of the applied stress intensity factor due to a crack resistance increase with crack extension. This is due to a shielding of the stress intensity factor near the crack tip caused by transformation toughening or bridging. A shift of the crack velocity — stress intensity factor curve towards higher values of KI can be observed. If the R-Curve effect is substracted from experimental results, an unique crack rate-stress intensity factor at the crack tip curve is obtained.
The crack propagation behaviour under cyclic loading is also influenced by the R-Curve. The crack velocities under alternative stresses are increased. The analysis of fatigue shows that two mechanisms intervene: stress corrosion and pure cyclic mechanisms. The increase of crack rates under cyclic loading is due to a reduction of toughening mechanisms.
Thermal shock behaviour of ceramics can be analysed by a fracture mechanics approach. Materials exhibiting R-Curve behaviour present three crack propagation stages: stable, unstable and again stable propagation. With a strong R-Curve effect, unstable propagation can be avoided so that the retained strength can be enhanced. The R-Curve concept is required to explain the thermal-shock behaviour of ceramics and leads to a good prediction when R-Curves are measured at the temperature of thermal shock.
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Fantozzi, G., Chevalier, J., Saâdaoui, M. (2002). R-Curve Effect on Slow Crack Growth and Thermal Shock of Ceramics. In: Bradt, R.C., Munz, D., Sakai, M., Shevchenko, V.Y., White, K. (eds) Fracture Mechanics of Ceramics. Springer, Boston, MA. https://doi.org/10.1007/978-1-4757-4019-6_17
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DOI: https://doi.org/10.1007/978-1-4757-4019-6_17
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